"He's just going from place to place, doing things that aren't making sense," the source says

By Steve Helling and Michele Corriston
Updated September 14, 2015 07:30 PM
Credit: Splash News

Scott Disick seemed to be back on track and focusing on his children after splitting from longtime love Kourtney Kardashian earlier this summer, but a source close to him worries he’s headed for trouble once more.

“He’s totally lost right now,” the source tells PEOPLE of the father of three. “He’s just going from place to place, doing things that aren’t making sense. He’s recording a video. No, he’s building his brand. He’s hanging out with brand new people. That’s sort of his issue in general, that he can’t focus.”

Disick, 32, sparked buzz that he’s starring in rapper (and Khloé Kardashian‘s former beau) French Montana’s music video last week, and he’s been spotted partying with his ex’s little sister Kylie Jenner. He was also linked to Kardashian family friend Kimberly Stewart, though her mother denied the rumor to PEOPLE.

Despite a friend saying last month that Disick getting back with Kourtney, 36, wouldn’t be surprising, this source says that ship has sailed.

“The thought was that he was going to try for a reconciliation, but now it seems like that’s not going to happen,” the source explains. “He isn’t working on himself, which is one of the conditions he has to meet for Kourtney to take him back. He’s not working on himself at all.

“Everyone is very worried about him. Whatever his problems are with the family, no one wants him to be hurt.”

The parents of three broke up in July after Disick was photographed partying in Monte Carlo with another woman. Although he’s been in and out of rehab for years, the source does not know whether he is sober or drinking again – and says that uncertainty isn’t a good sign.

“He’s not talking about it. Scott has in the past been willing to talk about what he’s going through, seeking advice,” the source explains. “He’s not seeking advice from anyone anymore, probably because he knows he’s not going to like the advice that we give him.”